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[ns] Why Link have to scheduling or packet dropping?

Hi.
I'm now try to implement SCFQ on NS 2.1b6
In NS, Why Link do scheduling or packet dropping?
I mean...
for example

my network configuration as follows

sender1 \
                 router--receiver
sender2 /

Link between router and receiver, 10Mbps SCFQ etc etc..
And I modify drr.cc for implement SCFQ and use system virtual time as static
double variable.

I want router's output link(router=> receiver) does SCFQ scheduling

But When simulation I found receiver "receiver => router" chage my system
virtual time

How can I enable "only router's output link scheduling"?

and if i can't is there any reason why link have scheduling or droping
strategy in NS?

__

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